On July 20 in …
1799 — Tekle Guyorgis I begins the first of his six separate reigns as emperor of Ethiopia.
1807 — Nicephone Nuepce is awarded a patent by Napolean for what he calls the “Pyreolophore.” It is the first internal combustion engine and was used to power a boat upstream on the river Saone in France.
1903 — The Ford Motor Company ships its first car.
1917 — The modern Kingdom of Yugoslavia is created by the Corfu Declaration, a document codifying an agreement between the Yugoslav Committee and the Kingdom of Serbia.
1968 — The first International Special Olympics Summer Games begin at Soldier Field in Chicago, with about 1,000 athletes participating.